CN105928811A - Asphalt mixture fatigue resistance testing apparatus - Google Patents
Asphalt mixture fatigue resistance testing apparatus Download PDFInfo
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- CN105928811A CN105928811A CN201610555463.3A CN201610555463A CN105928811A CN 105928811 A CN105928811 A CN 105928811A CN 201610555463 A CN201610555463 A CN 201610555463A CN 105928811 A CN105928811 A CN 105928811A
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- 239000010426 asphalt Substances 0.000 title claims abstract description 84
- 239000000203 mixture Substances 0.000 title claims abstract description 77
- 238000012360 testing method Methods 0.000 title claims abstract description 44
- 238000006073 displacement reaction Methods 0.000 claims abstract description 25
- 230000007613 environmental effect Effects 0.000 claims description 6
- 230000001939 inductive effect Effects 0.000 claims description 3
- 230000002929 anti-fatigue Effects 0.000 abstract description 16
- 230000006698 induction Effects 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract description 3
- 238000011056 performance test Methods 0.000 description 4
- 230000000737 periodic effect Effects 0.000 description 4
- 229920006335 epoxy glue Polymers 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 201000010099 disease Diseases 0.000 description 2
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 2
- 238000009661 fatigue test Methods 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 238000013001 point bending Methods 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000002301 combined effect Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000009916 joint effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
- G01N3/36—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces generated by pneumatic or hydraulic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
本发明属于路面材料性能测试技术领域，涉及一种沥青混合料抗疲劳性能测试装置，包括箱体、竖向施压装置、位移传感器、第一滑动块、第二滑动块以及外接电脑；第一滑动块以及第二滑动块并行铺设在箱体上并可在箱体上自如滑动；位移传感器置于第一滑动块以及第二滑动块之间；第一滑动块的上表面、位移传感器的感应头以及第二滑动块的上表面处于同一水平面；竖向施压装置置于待测试沥青混合料的正上方并向待测试沥青混合料施加竖向压力；竖向施压装置以及位移传感器分别与外接电脑相连。本发明提供了一种沥青混合料抗疲劳性能测试装置，能够更加真实的模拟沥青混合料在路面结构中所受到的复杂应力状态。
The invention belongs to the technical field of pavement material performance testing, and relates to an asphalt mixture anti-fatigue performance testing device, which includes a box body, a vertical pressure applying device, a displacement sensor, a first sliding block, a second sliding block and an external computer; the first The sliding block and the second sliding block are laid on the box body in parallel and can slide freely on the box body; the displacement sensor is placed between the first sliding block and the second sliding block; the upper surface of the first sliding block, the induction of the displacement sensor The upper surface of the head and the second sliding block is at the same level; the vertical pressure device is placed directly above the asphalt mixture to be tested and applies vertical pressure to the asphalt mixture to be tested; the vertical pressure device and the displacement sensor are respectively connected with Connect to an external computer. The invention provides an asphalt mixture anti-fatigue performance testing device, which can more realistically simulate the complex stress state that the asphalt mixture receives in the pavement structure.
Description
技术领域technical field
本发明属于路面材料性能测试技术领域，涉及一种抗疲劳性能测试装置，尤其涉及一种沥青混合料抗疲劳性能测试装置。The invention belongs to the technical field of performance testing of pavement materials, and relates to an anti-fatigue performance testing device, in particular to an asphalt mixture anti-fatigue performance testing device.
背景技术Background technique
沥青混合料路面在使用中，长期受到车辆荷载与气候等因素综合作用，并使路面长期处于应变与应力的不断变化下，由于沥青混合料是弹塑性材料，其弹性性能不可能使路面结构强度全部恢复，只会在塑性性能作用下不断下降。当路面荷载重复超过一定次数以后，这样就会出现裂纹等病害，疲劳裂缝的产生进而会导致一系列的病害，如水分下渗、坑槽、剥落、松散等，从而导致路面的舒适性和耐久性降低，路面养护维修养护次数和养护费用的增加。因此，如何提升路面的抗疲劳性能，延长路面寿命一直是道路工作者研究的方向。During the use of asphalt mixture pavement, it has been subjected to the combined effects of vehicle load and climate for a long time, and the pavement is under constant changes in strain and stress for a long time. Since asphalt mixture is an elastoplastic material, its elastic properties cannot make the pavement structural strength All recovery will only continue to decline under the action of plastic properties. When the pavement load is repeated for more than a certain number of times, cracks and other diseases will appear, and the generation of fatigue cracks will lead to a series of diseases, such as water infiltration, potholes, peeling, loosening, etc., which will lead to the comfort and durability of the road surface. Reduced durability, increased maintenance times and maintenance costs for pavement maintenance. Therefore, how to improve the anti-fatigue performance of pavement and prolong the service life of pavement has always been the research direction of road workers.
目前，《公路工程沥青及沥青混合料试验规程》(JTG E20-2011)中规定采用四点弯曲疲劳寿命进行沥青混合料抗疲劳特性的研究，四点弯曲疲劳试验能够检验沥青混合料抗疲劳性能的差异，但由于沥青混合料在路面结构层中，不仅承受车辆荷载的疲劳荷载应力，而且还受结构层间的剪切作用以及温度梯度产生的温度疲劳应力等。因此，亟需研发一种沥青混合料抗疲劳性能测试装置，全面的考虑了车辆荷载应力、层间剪应力、拉应力等作用力，更加真实的模拟沥青混合料在路面结构中所受到的复杂应力的状态。At present, the "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20-2011) stipulates that the four-point bending fatigue life is used to study the fatigue resistance of asphalt mixtures. The four-point bending fatigue test can test the fatigue resistance of asphalt mixtures. However, because the asphalt mixture in the pavement structure layer not only bears the fatigue load stress of the vehicle load, but also suffers from the shear action between the structural layers and the temperature fatigue stress caused by the temperature gradient. Therefore, there is an urgent need to develop a test device for the fatigue resistance of asphalt mixture, which fully considers the vehicle load stress, interlayer shear stress, tensile stress and other forces, and more realistically simulates the complex stresses on asphalt mixture in the pavement structure. state of stress.
发明内容Contents of the invention
基于背景技术所提出的目前疲劳试验的测试装置的测试条件与沥青路面实际工作状态相差较大，本发明提供了一种沥青混合料抗疲劳性能测试装置，能够更加真实的模拟沥青混合料在路面结构中所受到的复杂应力状态。The test conditions of the current fatigue test test device proposed based on the background technology are quite different from the actual working state of the asphalt pavement. The present invention provides a test device for the anti-fatigue performance of asphalt mixture, which can more realistically simulate the asphalt mixture on the road surface. The complex stress state in the structure.
为实现上述目的，本发明采取如下技术方案：To achieve the above object, the present invention takes the following technical solutions:
一种沥青混合料抗疲劳性能测试装置，其特征在于：所述沥青混合料抗疲劳性能测试装置包括箱体、竖向施压装置、位移传感器、第一滑动块、第二滑动块以及外接电脑；所述第一滑动块以及第二滑动块并行铺设在箱体上并可在箱体上自如滑动；所述位移传感器置于第一滑动块以及第二滑动块之间；所述第一滑动块的上表面、位移传感器的感应头以及第二滑动块的上表面处于同一水平面；待测试沥青混合料铺设在第一滑动块以及第二滑动块的上表面上；所述竖向施压装置置于待测试沥青混合料的正上方并向待测试沥青混合料施加竖向压力；所述竖向施压装置以及位移传感器分别与外接电脑相连。An asphalt mixture anti-fatigue performance test device, characterized in that: the asphalt mixture anti-fatigue performance test device includes a box, a vertical pressure device, a displacement sensor, a first sliding block, a second sliding block and an external computer The first sliding block and the second sliding block are laid in parallel on the box body and can slide freely on the box body; the displacement sensor is placed between the first sliding block and the second sliding block; the first sliding block The upper surface of the block, the induction head of the displacement sensor and the upper surface of the second sliding block are at the same level; the asphalt mixture to be tested is laid on the upper surfaces of the first sliding block and the second sliding block; the vertical pressure device Place it directly above the asphalt mixture to be tested and apply vertical pressure to the asphalt mixture to be tested; the vertical pressure applying device and the displacement sensor are respectively connected to an external computer.
作为优选，本发明所采用的箱体上铺设有滑轨；所述第一滑动块以及第二滑动块分别设置在滑轨上并在滑轨上自如滑动。Preferably, slide rails are laid on the box used in the present invention; the first sliding block and the second sliding block are respectively arranged on the slide rails and slide freely on the slide rails.
作为优选，本发明所采用的第一滑动块以及第二滑动块的底部均设置有滑动槽；所述第一滑动块以及第二滑动块分别通过滑动槽设置在滑轨上并在滑轨上自如滑动。As a preference, the bottoms of the first sliding block and the second sliding block used in the present invention are provided with sliding grooves; Glides freely.
作为优选，本发明所采用的竖向施压装置包括加载系统以及与加载系统相连的压力杆；所述加载系统与外接电脑相连；所述压力杆作用于待测试沥青混合料的正上方。Preferably, the vertical pressure applying device used in the present invention includes a loading system and a pressure rod connected to the loading system; the loading system is connected to an external computer; and the pressure rod acts directly above the asphalt mixture to be tested.
作为优选，本发明所采用的加载系统是MTS液压伺服加载系统；所述MTS液压伺服加载系统的荷载施加频率为10Hz。Preferably, the loading system used in the present invention is an MTS hydraulic servo loading system; the load application frequency of the MTS hydraulic servo loading system is 10 Hz.
作为优选，本发明所采用的压力杆的底端部是半球状的。Preferably, the bottom end of the pressure rod used in the present invention is hemispherical.
作为优选，本发明所采用的沥青混合料抗疲劳性能测试装置还包括设置在箱体上的第一限位装置以及第二限位装置；所述第一滑动块以及第二滑动块分别设置在第一限位装置以及第二限位装置中；所述第一限位装置以及第二限位装置的相对位置是可调整的。As a preference, the asphalt mixture anti-fatigue performance testing device adopted in the present invention also includes a first limiting device and a second limiting device arranged on the box body; the first sliding block and the second sliding block are respectively arranged on Among the first limiting device and the second limiting device; the relative positions of the first limiting device and the second limiting device are adjustable.
作为优选，本发明所采用的第一限位装置以及第二限位装置均包括卡槽以及与卡槽相对的挡板；所述第一滑动块以及第二滑动块分别设置在卡槽以及挡板之间。Preferably, the first limiting device and the second limiting device used in the present invention both include a slot and a baffle opposite to the slot; the first sliding block and the second sliding block are respectively arranged in the slot and the blocking plate. between the boards.
作为优选，本发明所采用的卡槽与挡板之间的距离是可调的。Preferably, the distance between the slot and the baffle used in the present invention is adjustable.
作为优选，本发明所采用的沥青混合料抗疲劳性能测试装置还包括置于箱体上并罩于第一滑动块、第二滑动块以及待测试沥青混合料上部的环境箱。Preferably, the asphalt mixture anti-fatigue performance testing device adopted in the present invention further includes an environmental chamber placed on the box body and covering the first sliding block, the second sliding block and the upper part of the asphalt mixture to be tested.
本发明的优点是：The advantages of the present invention are:
本发明提供了一种沥青混合料抗疲劳性能测试装置，包括箱体、竖向施压装置、位移传感器、第一滑动块、第二滑动块以及外接电脑；第一滑动块以及第二滑动块并行铺设在箱体上并可在箱体上自如滑动；位移传感器置于第一滑动块以及第二滑动块之间；第一滑动块的上表面、位移传感器的感应头以及第二滑动块的上表面处于同一水平面；待测试沥青混合料铺设在第一滑动块以及第二滑动块的上表面上；竖向施压装置置于待测试沥青混合料的正上方并向待测试沥青混合料施加竖向压力；竖向施压装置以及位移传感器分别与外接电脑相连。。本发明通过环氧胶将待测试沥青混合料粘到滑动块上，设定加载频率和加载波形，加载系统施加竖向压力，压力通过压杆传递到待测试沥青混合料的正上方，粘结待测试沥青混合料的两块滑动块可以在滑轨中自由滑动，也可以通过挡板和卡槽分别限制两块滑动块的位置，在卡槽的中间设置位移传感器，位移传感器的感应头与滑动块的上表面处于同一水平面，环境箱的测试温度通过温控仪进行控制。本发明同时考虑了压应力、拉应力以及层间剪切力对沥青混合料性能的影响，更加真实的模拟沥青混合料在实际路面中的工作状态。The invention provides a device for testing the anti-fatigue performance of asphalt mixture, which includes a box body, a vertical pressure device, a displacement sensor, a first sliding block, a second sliding block and an external computer; the first sliding block and the second sliding block Laid on the box in parallel and can slide freely on the box; the displacement sensor is placed between the first sliding block and the second sliding block; the upper surface of the first sliding block, the inductive head of the displacement sensor and the second sliding block The upper surface is at the same level; the asphalt mixture to be tested is laid on the upper surfaces of the first sliding block and the second sliding block; the vertical pressure device is placed directly above the asphalt mixture to be tested and applied to the asphalt mixture to be tested. Vertical pressure; the vertical pressure applying device and the displacement sensor are respectively connected with an external computer. . In the present invention, the asphalt mixture to be tested is glued to the sliding block by epoxy glue, the loading frequency and the loading waveform are set, the loading system applies vertical pressure, and the pressure is transmitted to the directly above the asphalt mixture to be tested through the pressure rod, and the bonding The two sliding blocks of the asphalt mixture to be tested can slide freely in the slide rail, or the positions of the two sliding blocks can be restricted by the baffle and the card slot respectively, and a displacement sensor is set in the middle of the card slot, and the sensing head of the displacement sensor and the The upper surface of the sliding block is at the same level, and the test temperature of the environmental chamber is controlled by a temperature controller. The invention simultaneously considers the influence of compressive stress, tensile stress and interlayer shear force on the performance of the asphalt mixture, and more realistically simulates the working state of the asphalt mixture on the actual road surface.
附图说明Description of drawings
图1是本发明所提供的沥青混合料抗疲劳性能测试装置的结构示意图；Fig. 1 is the structural representation of asphalt mixture anti-fatigue performance testing device provided by the present invention;
图中标记说明如下：The markings in the figure are explained as follows:
1-箱体；2-滑轨；3-第一滑动块；4-待测试沥青混合料；5-位移传感器；6-压力杆；7-MTS液压伺服加载系统；8-外接电脑；9-环境箱；10-卡槽；11-挡板；12-第二滑动块。1-box; 2-slide rail; 3-the first sliding block; 4-asphalt mixture to be tested; 5-displacement sensor; 6-pressure rod; 7-MTS hydraulic servo loading system; 8-external computer; 9- Environmental box; 10-card slot; 11-baffle plate; 12-second sliding block.
具体实施方式detailed description
下面结合附图对本发明进一步详细说明，但是本发明不仅限于下述的实施方式，不详之处见发明内容部分。The present invention will be further described in detail below in conjunction with the accompanying drawings, but the present invention is not limited to the following embodiments, and for details, please refer to the Summary of the Invention.
参见图1，本发明提供了一种沥青混合料抗疲劳性能测试装置，沥青混合料抗疲劳性能测试装置包括箱体1、竖向施压装置、位移传感器5、第一滑动块3、第二滑动块12以及外接电脑8；第一滑动块3以及第二滑动块12并行铺设在箱体1上并可在箱体1上自如滑动；位移传感器5置于第一滑动块3以及第二滑动块12之间；第一滑动块3的上表面、位移传感器5的感应头以及第二滑动块12的上表面处于同一水平面；待测试沥青混合料4铺设在第一滑动块3以及第二滑动块12的上表面上；竖向施压装置置于待测试沥青混合料4的正上方并向待测试沥青混合料4施加竖向压力；竖向施压装置以及位移传感器5分别与外接电脑8相连。Referring to Fig. 1, the present invention provides a kind of anti-fatigue performance test device of asphalt mixture, and the anti-fatigue performance test device of asphalt mixture comprises box body 1, vertical pressure device, displacement sensor 5, first sliding block 3, second The sliding block 12 and the external computer 8; the first sliding block 3 and the second sliding block 12 are laid in parallel on the box body 1 and can slide freely on the box body 1; the displacement sensor 5 is placed on the first sliding block 3 and the second sliding block Between the blocks 12; the upper surface of the first sliding block 3, the induction head of the displacement sensor 5 and the upper surface of the second sliding block 12 are at the same level; the asphalt mixture 4 to be tested is laid on the first sliding block 3 and the second sliding block On the upper surface of the block 12; the vertical pressure applying device is placed directly above the asphalt mixture 4 to be tested and applies a vertical pressure to the asphalt mixture 4 to be tested; the vertical pressure applying device and the displacement sensor 5 are respectively connected to the external computer 8 connected.
箱体1上铺设有滑轨2；第一滑动块3以及第二滑动块12分别设置在滑轨2上并在滑轨2上自如滑动。A slide rail 2 is laid on the box body 1 ; the first slide block 3 and the second slide block 12 are respectively arranged on the slide rail 2 and slide freely on the slide rail 2 .
第一滑动块3以及第二滑动块12的底部均设置有滑动槽；第一滑动块3以及第二滑动块12分别通过滑动槽设置在滑轨2上并在滑轨2上自如滑动。Both the bottoms of the first sliding block 3 and the second sliding block 12 are provided with sliding grooves; the first sliding block 3 and the second sliding block 12 are respectively arranged on the sliding rail 2 through the sliding grooves and slide freely on the sliding rail 2 .
竖向施压装置包括加载系统以及与加载系统相连的压力杆6；加载系统与外接电脑8相连；压力杆6作用于待测试沥青混合料4的正上方。加载系统是MTS液压伺服加载系统7；MTS液压伺服加载系统7的荷载施加频率为10Hz，加载波形为正弦波，采用应力控制的疲劳模式。压力杆6的底端部是半球状的。The vertical pressure applying device includes a loading system and a pressure rod 6 connected to the loading system; the loading system is connected to an external computer 8; the pressure rod 6 acts directly above the asphalt mixture 4 to be tested. The loading system is the MTS hydraulic servo loading system 7; the load application frequency of the MTS hydraulic servo loading system 7 is 10 Hz, the loading waveform is a sine wave, and the stress-controlled fatigue mode is adopted. The bottom end of the pressure rod 6 is hemispherical.
沥青混合料抗疲劳性能测试装置还包括设置在箱体1上的第一限位装置以及第二限位装置；第一滑动块3以及第二滑动块12分别设置在第一限位装置以及第二限位装置中；第一限位装置以及第二限位装置的相对位置是可调整的。The asphalt mixture anti-fatigue performance testing device also includes a first limiting device and a second limiting device arranged on the box body 1; the first sliding block 3 and the second sliding block 12 are respectively arranged on the first limiting device and the second limiting device. Among the two limiting devices; the relative positions of the first limiting device and the second limiting device are adjustable.
第一限位装置以及第二限位装置均包括卡槽10以及与卡槽10相对的挡板11；第一滑动块3以及第二滑动块12分别设置在卡槽10以及挡板11之间。Both the first limiting device and the second limiting device include a card slot 10 and a baffle plate 11 opposite to the card slot 10; the first sliding block 3 and the second sliding block 12 are respectively arranged between the card slot 10 and the baffle plate 11 .
卡槽10与挡板11之间的距离是可调的。The distance between the card slot 10 and the baffle 11 is adjustable.
述沥青混合料抗疲劳性能测试装置还包括置于箱体1上并罩于第一滑动块3、第二滑动块12以及待测试沥青混合料4上部的环境箱9。The asphalt mixture anti-fatigue performance testing device also includes an environmental chamber 9 placed on the box body 1 and covered on the first sliding block 3, the second sliding block 12 and the upper part of the asphalt mixture 4 to be tested.
本发明在具体使用时，首先通过环氧胶将待测试沥青混合料4粘到滑动块3上，设定加载频率、加载波形和间歇时间，MTS液压伺服加载系统7施加竖向压力，压力通过压力杆6传递到待测试沥青混合料4的正上方，粘结待测试沥青混合料4的两块滑动块3可以在滑轨2中自由滑动，也可以通过挡板11和卡槽10将其位置限制，在卡槽10的中间设置位移传感器5，位移传感器5的感应头与滑动块3的上表面处于同一水平面，环境箱9的测试温度通过温控仪进行控制。通过该测试装置可以测试待测试沥青混合料4在不同受力状态下的疲劳寿命，当滑动块3的两侧没有被挡板11限制时，待测试沥青混合料4在竖向的周期性压应力作用下，待测试沥青混合料4底部会产生拉应力，在压应力和拉应力反复作用下，待测试沥青混合料4底部会产生疲劳裂缝，当滑动块3的位置两侧被挡板11和卡槽10限制，待测试沥青混合料4在竖向周期性压应力作用下、底部会产生拉应力和剪应力，在拉应力和剪应力共同作用下，待测试沥青混合料4也会产生疲劳裂缝。When the present invention is used in practice, the asphalt mixture 4 to be tested is first glued to the sliding block 3 through epoxy glue, the loading frequency, loading waveform and intermittent time are set, and the MTS hydraulic servo loading system 7 applies vertical pressure, and the pressure passes through The pressure bar 6 is passed directly above the asphalt mixture 4 to be tested, and the two sliding blocks 3 bonded to the asphalt mixture 4 to be tested can slide freely in the slide rail 2, or they can be moved by the baffle plate 11 and the slot 10. For position limitation, a displacement sensor 5 is set in the middle of the card slot 10, the inductive head of the displacement sensor 5 is at the same level as the upper surface of the sliding block 3, and the test temperature of the environmental chamber 9 is controlled by a temperature controller. The fatigue life of the asphalt mixture 4 to be tested under different stress states can be tested by this test device. Under the action of stress, the bottom of the asphalt mixture 4 to be tested will produce tensile stress, and under the repeated action of compressive stress and tensile stress, fatigue cracks will be generated at the bottom of the asphalt mixture 4 to be tested. Restricted by the slot 10, the asphalt mixture 4 to be tested will produce tensile stress and shear stress at the bottom under the action of vertical periodic compressive stress, and the asphalt mixture 4 to be tested will also produce fatigue cracks.
实施例1：Example 1:
采用旋转压实成型的方式制备试件，也可以直接从路面结构中钻取直径为150mm的试件，在圆柱体轴线两端进行平行切割，切掉两端部分，切至高38mm；再在圆柱体直径两端平行对称切割，使得试件的宽度为75mm，标准试件的尺寸为长150mm、宽为75mm、高为38mm，将滑动块3放置在滑轨2上，左边的卡槽10和挡板11限制左边的滑动块3，右边的卡槽10和挡板11限制右边的滑动块3，在滑动块3上表面均匀涂上环氧胶，将待测试沥青混合料4粘结在两块滑动块3上，养护一定时间，将环境箱9温度调整为测试温度，将待测试沥青混合料4放置在环境箱9内保温2～4h，确保待测试沥青混合料4的内部温度与环境箱9温度保持一致，选择MTS液压伺服加载系统7的加载波形为正弦波、加载频率为10Hz，加载系统连接压力杆6，并将周期性压力通过压力杆6传递到待测试沥青混合料4的上表面，挡板11的位置可以调节，当两块滑动块3两侧没有被挡板11限制时，待测试沥青混合料4在竖向的周期性压应力作用下，待测试沥青混合料4底部会产生拉应力，在压应力和拉应力反复作用下，待测试沥青混合料4会产生疲劳裂缝，MTS液压伺服加载系统7会将测试过程中的测试数据传递到外接电脑8上，根据测试数据计算待测试沥青混合料4的疲劳寿命；当两块滑动块3的两侧被挡板和卡槽限制时，待测试沥青混合料4在竖向周期性压应力作用下、底部会产生拉应力和剪应力，在拉应力和剪应力共同作用下，待测试沥青混合料也会产生疲劳裂缝，通过测试数据计算待测试沥青混合料4的疲劳寿命。Prepare the test piece by rotary compaction molding, or directly drill a test piece with a diameter of 150mm from the pavement structure, cut parallel to both ends of the cylinder axis, cut off the two ends, and cut to a height of 38mm; The two ends of the body diameter are parallel and symmetrically cut, so that the width of the test piece is 75mm, and the size of the standard test piece is 150mm long, 75mm wide, and 38mm high. The baffle plate 11 restricts the sliding block 3 on the left side, the draw-in groove 10 and the baffle plate 11 on the right restrict the sliding block 3 on the right side, and the upper surface of the sliding block 3 is evenly coated with epoxy glue, and the asphalt mixture 4 to be tested is bonded on both sides. block the sliding block 3, maintain for a certain period of time, adjust the temperature of the environment box 9 to the test temperature, place the asphalt mixture 4 to be tested in the environment box 9, and keep it warm for 2 to 4 hours to ensure that the internal temperature of the asphalt mixture 4 to be tested is consistent with the environment. The temperature of the box 9 is kept consistent, the loading waveform of the MTS hydraulic servo loading system 7 is selected as a sine wave, and the loading frequency is 10 Hz. The loading system is connected to the pressure rod 6, and the periodic pressure is transmitted to the asphalt mixture 4 to be tested On the upper surface, the position of the baffle plate 11 can be adjusted. When the two sides of the sliding block 3 are not restricted by the baffle plate 11, the asphalt mixture 4 to be tested is under the action of vertical periodic compressive stress. Tensile stress will be generated at the bottom. Under the repeated action of compressive stress and tensile stress, the asphalt mixture 4 to be tested will produce fatigue cracks. The MTS hydraulic servo loading system 7 will transmit the test data during the test to the external computer 8. According to the test The data calculates the fatigue life of the asphalt mixture 4 to be tested; when the two sides of the two sliding blocks 3 are restricted by baffles and slots, the bottom of the asphalt mixture 4 to be tested will produce tension under the action of vertical periodic compressive stress. Stress and shear stress, under the joint action of tensile stress and shear stress, the asphalt mixture to be tested will also produce fatigue cracks, and the fatigue life of the asphalt mixture to be tested 4 is calculated based on the test data.
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